Strip structures



Sept. 29, 1964 J. s. REID v 3,150,423

STRIP STRUCTURES Filed Aug. 25, 1959 5 Sheets-Sheet 1 Fi. 1D

3S INVENTUR.

BY T

f 5770A 5X5' Sept. 29, 1964 J. s. REID sTRTR STRUCTURES 3 Sheets-Sheet 2 Filed Aug. 25, 1959 sept. 29, 1964 J. s. REID 3,150,423

STRIP STRUCTURES Filed Aug. 25, 1959 5 Sheets-Sheet 3 2 FEB? j @www United States Patent OpF Ohio Fried Aug. 25, 1959, ser. No'. 835,955 13 Claims. (Cl. 20--69) This invention relates to stripstructures for sealing, trimming, supporting and various other purposes. More particularly, the invention relates to cores for such strip structures, the cores being of elongated form, preferably of sheet metal, and of generally channel shape for ernbracing or straddling attachment to a suitable object, such as to a marginal portion of the object or to an edge flange thereof.

The invention has for one of its primary objects the Aprovision of a strip structure core With which can be easily, quickly and effectively associated either a coverving material, such as fabric or the like, to thereby provide, for example, a strip structure for trimming purposes, or a yieldable or cushioning material, such as rubber or the like, to thereby provide, for example, a strip structure for sealing purposes.

The invention has for another of its primary objects the provision of a strip structure core which is charac- .terized by its structural simplicity, the economy of its manufacture, and its overall eiectivenessin the accomplishment of its intended functions.

A more specific object of the present invention is the provision of a strip structure core which` possesses unusually great lexioility, both longitudinally and transversely, so that the core is capable of being readily and rrnly attached not only to flanges, marginal edge por- .tions and other parts which are of varying thiclmesses but also, to flanges, marginal edge portions and other parts which twist and turn or which otherwise have considerable and Vvaried rectilinear deviation.

A further more specic object of the present invention is the provision of a strip structure core which comprises core-forming elements disposed in a generally zig-Zag manner, the end portions of adjacent elements being in overlapping and preferably in abutting relationship and each pair of overlapping end portions being provided with at least one projection, preferably of pronged or'pointed form, for core-attaching purposes. Y

A further more specic object of the present invention `is the provision of a strip structure core in which the core- Vattaching projections are suitably hardened, such as by being chromium plated, to thereby improve their `coreattaching function and also to enable the other parts of the core-to be made, if desired, of less'expensive metal.

A further more specific object of the present invention is the provision of a strip structure core in which the core-attaching projections are so constructed vand arranged as to effectively interlock the overlapping end portions of the Zig-Zag disposed core-forming projections, with the consequently strengthening of the core but with- -out impairment of the desired iiexibility of the core.

A further more specific object of the present invention is the provision of a strip structure core in which each pair of the overlapping end portions of the Zig-Zag disposed core-forming elements is interlocked by two coreattaching projections, the projections of each such pair of overlapping end portions being in aligned'contact for increased strength and rigidity.

Further objects of the present invention, and certain of its practical advantages, will be referred to in or will be evident from the following description of several ern- 3,150,423 Patentedrsept. 29, 1964 bodiments of the/invention, as illustrated in the accompanying drawings, in which: l

FIG. l is a fragmentary plan View of a strip structure coreV constructed in accordance with one embodiment of the invention, the core being in ilat form preliminary to its being bent into channel shape;

FIG. 2 is a cross-sectional View of the core as shown in FIG. 1, the view being on theV line Z-Zof FIG. l;

FIG. 3 is a cross-sectional vie'w of the core of FIG. l but showing the core in its channel shape;

FIGS. 4 and 5 are fragmentary side elevational views ofthe channel-shaped core, the core being arcuately bent to show its longitudinal flexibility;

FIGS. 6 and 7 are fragmentary plank views of the channel-shaped core, the core being attached by projections thereof to the marginal portions or the edge Vflanges of an object, and the views showing how the core conforms or adapts itself to width variations and to rectilinear deviations; j

FIG. 8 is a cross-sectional View of one longitudinal edge portion of the core as shown in FIG. 2 but with the core-attaching projections being chromium plated to harden them for improved core attachment;

FIG. 9 is a cross-sectional perspective view of the core constructed in accordance with the first embodiment of the invention, the core having associated therewith flexible or yieldable material to thereby provide a strip structure for sealing purposes;

FIG. 10 is a fragmentary perspectiveview of a channel-shaped core generally corresponding to the one constituting the rst embodiment of the invention but with the core-attaching projections extending alternately inwardly into and outward from the channel of the core;

FIGS. 1l, 12 and 13 are views corresponding to FIGS. 1, 2 and 3, but with the core-attaching projections being longitudinally, rather than transversely, disposed;

FIG. 14 is a View similar toJFIGS. 1 and 11 but with the core-attaching projections extending in the opposite directions from the core-attaching projections of FIG. 1;

FIG. 15 is a cross-sectional perspective view of a covered channel-shaped core which differs from the core of the iirst embodiment in that the free longitudinal edge portions of the core side walls are bent laterally outwardly or divergently;

FIG. 16 is a cross-sectional perspective view of a covered lchannel-shaped core in which the core side walls are inwardly odset from the side edges of the core base, and in which the core has been pressed into the groove of an object for the retention of the marginal edge portions of a covering for said object;

FIG. 17 is a cross-sectional view of the core of FIG. 16;

FIG. 18 is a cross-sectional perspective view of a core constructed in accordance with the rst embodiment of the invention, the view showing the attachment of the core to the marginal portion or edge flange of an object for the support of a cable or the like; l

FIGS. 19, 20 and 21 are views generally corresponding to FIGS. 1, 2 and 3 and also toI FIGS. 11, 12 and 13, but in which the core-attaching projections are of pressed or punched out circular form;

FIGS. 22, 23 and 24 are views generally corresponding to FIGS. 1, 2 and 3, to FIGS. 11, 12 and 13 and to FIGS. 19, 20 and 21, but in which the core-attaching projections are the laterally bent free longitudinal edge portions of the side walls 0f the core; Y

FIG. 25 is a View generally corresponding to FIGS. l, 11, 14, 19 and 22 but in which the core is of increased Width to provide not only a channel-shaped part but also a lateral extension for the reception of sealing material or the like;

FIG. 26 is a cross-sectional perspective view of the es core of FIG. 25, with yieldable or resilient material being mounted on the lateral extension thereof to provide a sealing strip structure;

FIGS. 27 and 28 are views generally corresponding to FIGSZ and 3, to FIGS. 12 and 13 and to FIGS. 2O and 21, but showing a core in which the inner and outer portions thereof are in spaced relation; and

FIGS. 29 and 30 are views generally corresponding to FIGS. 2 and 3 and showing a core which differs from the first embodiment there shown only in that the core-forming elements are separate members suitably interlocked in core-forming relation.

As will hereinafter more fully appear, cores embodying the present invention may have associated therewith suitable covering material, such as of fabric or the like, to thereby provide, for example, a strip structure for trimming or other purposes where a core covering is necessary or desirable; or the cores may have associated therewith suitable yieldable or resilient material, such as of rubber or the like, to thereby provide, for example, a strip structure for sealing purposes; or the cores may have associated therewith both covering material and sealing material, depending upon the type of strip structure of which the core is used.

Briefiy stated, cores embodying the present invention are of elongated form and of channel shape in cross section, and comprise inner and outer layers of core-forming elements disposed in a generally zig-zag manner, with the end portions of adjacent elements being in overlapping relationship, and with each pair of said overlapping end portions being provided with at least one core-attaching projection. Preferably, the core projections are of pointed or prong form and preferably also, the core projections are so constructed and arranged as to effectively interlock the overlapping end portions of adjacent coreforming elements.

The core is thus one of relatively sturdly form and yet of unusually high flexibility, both longitudinally and transversely, which enables the core to be readily and firmly attached, in embracing or straddling relationship, to a marginal portion of an object or to an edge flange thereof, regardless of variations in the wid th of said marginal portion or edge flange or rectilinear deviations thereof.

Referring now to that embodiment of the invention illustrated in FIGS. 1 to 7, the core there illustrated is made of a relatively narrow band of sheet metal, preferably steel, which is bent or otherwise manipulated to provide upper and lower layers of core-forming elements disposed in a generally zig-zag manner, with the end portions of adjacent upper and lower elements being in overlapping relationship, as best shown in FIG. l.

In this view and also in FIG. 2, the core formed by the zig-zag elements is in fiat condition, with the elements 11 of the lower layer and the elements 1.2 of the upper layer being in contacting relation. However, in its iinal form, the core is of channel shape in cross section, as shown in FIG. 3, for embracing or straddling attachment to a marginal portion or an edge flange of the object with which it is used.

For the attachment of the core to the marginal portion of an object or to an edge flange thereof, such as the marginal portions or edge flanges 13 and 14- of FIGS. 6 and 7, each pair of the overlapping end portions 16 of the core-forming elements 11, 12 is provided with at least one core-attaching projection, which preferably is of pointed or pronged or barb form, as here shown, for improved gripping engagement with the object to which the core is to be attached in use thereof. As will be readily understood, the core projections may be produced in various ways or by various means, but they are here produced, with obvious economy and structural simplicity, by pressing or punching them from the metal of the coreforming elements.

If desired, the core projections may have only an attaching function, namely, (a) the attachment of the core Cil to a suitable object for use therewith, or (b) the attachment to the core of suitable covering and/ or sealing material, or (c) both types of attachments. Freferably, however, the core projections are so constructed and arranged as to have the additional and quite important function of interlocking the overlapping end portions of the coreforming elements.

For the accomplishment of their interlocking function, the core projections of the core-forming elements of one layer are caused to extend through suitable aligned passageways in the core-forming elements of the other layer. If the core projections are to extend into the channel 15 of the core, as in the embodiment of the invention illustrated in this first embodiment of the invention (FIGS. l to 7), the core projections may be pressed or punched from the end portions of the core-forming elements 11 of the outer layer of elements (the lower layer in FIGS. 1 and 2) and caused to extend inwardly through suitable aligned passageways in the adjacent end portions of the core-forming elements 12 of the inner layer of elements (the upper layer in FIGS. 1 and 2). If, however, the core projections are to extend outwardly from the channel 15 of the core, as in the hereinafter described embodiment of `the invention illustrated in FIGS. 16 and 17, the core projections may be pressed or punched from the end portions of the core-forming elements 12 of the inner layer of elements and caused to extend outwardly through suitable aligned passageways in the adjacent end portions of the core-forming elements 11 of the outer layer of elements.

Preferably, however, and as shown in this iirst embodiment of the invention, each of the end portions of each pair of the overlapping end portions 1G of the core-forming elements 11, 12 is provided with a projection, the two projections of each such pair being in aligned and abutting relationship, with the consequent provision of paired projections which are of exceptionally strong and sturdy character.

Inasmuch as the core projections of this first embodiment of the invention extend inwardly into the channel 15 of the core, the projections 16 of the end portions of the core-forming elements 11 of the outer layer of elements extend inwardly through aligned apertures 17 in the end portions of the core-forming elements 12 of the inner layer of elements, the apertures 17 resulting, as will be readily understood, from the nature of the formation of the inwardly extending projections 18 of the end portions of the core-forming elements 12 of the inner layer of elements. As the projections 15 and 18 of each abutting pair of projections are of substantially the same size and shape, the projections 16 in the end portions of the outer core-forming elements 11 have a snug or press fit in the apertures 17 in the end portions of the inner coreforming elements 12, and as a result, a firm and effective interlocking relationship is established between the end portions of each pair of overlapping end portions 10. However, as said overlapping and interlocked end portions lie or are disposed at the free longitudinal edge portions of the side walls 19 and 2) of the channel core, the desired flexibility of the core, both longitudinally and transversely, is not impaired.

FIGS. 4 and 5 show how readily the channel-shaped core of FIG. 3 can be longitudinally bent, convexly as in FIG. 4, with the overlapping end portions 10 of the coreforming elements moving farther apart or divergently during such convex longitudinal movement of the core, and concavely as in FIG. 5, with the overlapping end portions 10 of the core-forming elements moving closer together or convergently during such concave longitudinal movement of the core; and FIGS. 6 and 7 show how the core can readily conform or accommodate itself to marginal portions or edge flanges 13, 14 which vary in thickness, and/or which twist and turn, and/ or which otherwise possess varied and substantial rectilinear deviations.

Thus, as will be evident from the structural nature of the core (the zig-zag disposition of the core-forming elements, etc.) and as indicated in FIGS. 4 to 7, the present core is of unusually great fiexibility, both longitudinally and transversely, and yet due to the effective interlocking of the overlapping end portions of adjacent core-forming elements, the core possesses the desired strength and ruggedness.

Although cores embodying the present invention may be made of any suitable sheet metal, a relatively high carbon steel is particularly satisfactory, as it gives the core projections a hardness which is at all times desirable and sometimes quite necessary. However, if the core projections are otherwise made suciently hard, a low carbon and hencel less expensive steel can be used for the core.

One suitable way in which the core projections can be satisfactorily hardened is to plate or coat them with a metal such as chromium, and such an embodiment of the invention is shown in FIG. 8. In this view, 21 designates the chromium plating for the core projections 22, 23, projections which, likethe rest of the core, may be made of a low carbon vand therefore relatively inexpensive steel. The chromium plating of the core projections can'be effected, of course, in any suitable manner and by the use of any suitable means.

As heretofore mentioned, cores embodying the present invention may be suitably covered for the provision of strip structures for trimming or other purposes when a core covering is necessary or desirable, and/ or the cores may be provided with suitable yieldable or resilient material, such as rubber, for -the provision of a strip structure for sealing purposes.

In FIG. 9 is illustrated a sealing strip structure embodying the core of FIGS. 1 to 7, and as there shown, the core, generally designated by the reference numeral 24, has secured thereto, in embracing relation, the channelshaped portion 25 of a rubber sealing member, the winglike sealing portion 26 of which extends laterally from the upper edge of one of the side walls of the channelshaped portion 25. The rubber sealing member is preferably an extrusion, with the channel-shaped portion 25 j thereof being here provided at the upper edges of its side walls with flanges 27 down-turned into the core channel about the upper edges of the core side walls for the securement of the rubber sealing member to the core. As will be noted, the rubber flanges 2'7 space the upper 'edges of the core side walls from the tlanges 23, 29 of an object to which the core is attached by the gripping projections 30 thereof. If desired and as here shown, the channel-shaped portion 25 of the rubber sealing member may be provided with a covering 31 of pile fabric or other suitable material.

In the core of FIGS. l to 7, and in the core of FIG. 9, the core projections extend into the core channel, and in the core of FIGS. 16 and 17 to be hereinafter described, the core projections extend outwardly from the core channel. However, if desired, some of the core projections may extend into the core channel and other of the projections may extend outwardly therefrom. Such a core is shown in FIG. 10, in which the core projections extend alternately inwardly and outwardly, the inwardly extending projections being designated by the reference numeral 32 and the outwardly extending projections being designated by the reference numeral 33. The inwardly extending projections may be used, as in prior discussed cores embodying the invention, for the attachment of the core to the marginal portion or the edge flange of an object, las in FIGS. 6, 7 and 9, and the outwardly extending projections may be used for various purposes, such as the attachment to the core of covering or sealing material, or in the retention of the core in a groove or the like for trimming or allied purposes.

In the previously described cores of FIGS. l to 10, the core projections are transversely pressed or punched from the core, and extend downwardly toward the base of the core, as well as inwardly (FIGS. 1 to 9) or inwardly and outwardly (FIG. l0). If desired, however, the core projections may be longitudinally pressed or punched from the core, and may extend substantially at right angles to the core side walls. For purposes of illustration, such a core is shown in FIGS. 11, l2 and 13-views corresponding to FIGS. l, 2 and 3-and showing core projections 35 longitudinally pressed or punched from the core-forming elements 36, 37 and extending inwardly into the core channel at substantially right angles to lthe core side walls 38 and 39. As will be readily understood, the core of FIGS. 11, 12 and 13 functions in substantially the same way as the core illustrated in FIGS. l to 7 and constituting tre first embodiment of the invention.

In the core of FIG. 14, the core projections 40 are transversely pressed or punched from the core-forming elements 41, 42, as in the cores of FIGS. 1 to 10. However, it will be noted that the pointed ends of the core projections 4t) of FIG. 14 extend divergently when the core is in its preliminary flat form, as in FIG.V 14, and extend inwardly and upwardly when the core is in its final channel form (not shown). Because of its identity otherwise to the core of FIGS. 1 to 7, no further reference to the core of FIG. 14 is believed to be necessary. i

In the embodiment of the invention illustrated in FIG. 15, the core has the outer edge parts 44 of its overlapping and portions, or in other words, the free longitudinal edge parts of the core side walls, bent outwardly or divergently. Also, the core is provided with a suitable covering 45 of fabric or the like, which extends not only around the exterior of the core but downwardly into the core channel Where it is held by the core projections 46 which extend therethrough. As to this embodiment of the invention, no further reference to it is believed to be necessary.

In the embodiment of the invention illustrated in FIGS.

16 and 17, the core has its base portion 48 of substantially flat form, with the core side walls 49, 50 being inwardly offset fronrlthe side edges of the core base portion. As shown in FIG. 16, the core of this embodiment of the invention may be arrangedgwith its base portion 42 outwardiy disposed, within the groove 51 of an object 52 for the retention of the end portions of a covering 53 for said object.

Preferably and as here shown, the core of FIGS. 16 and 17 is exteriorly covered, as at 54, and such covering, if desired, may be lthe same as that used for the object 52. For 4the retention of the core covering 54, and also in part at least for the covering 53 of the object S2, the core projections 55 are utilized;

In FIG. 18 is shown how -a core 56 embodying the present invention can be used for the support of a cable 57 or the like along the marginal portion or edge ange 58 of an object. The core here shown is of the structural nature of the one illustrated in FIGS. 1 to 7, and as shown in FIG. 18, the core thereof straddles or embraces the cable 57 or the like and the marginal portion or edge flange 53, and is'secured to latter by the gripping engagement therewith of the barb-like projections 59 of the core.

In the embodiments of the invention heretofore described, the core projections have been of prong or barblike character, or in other words, of pointed forma type of projection which is particularly suitable for gripping engagement with a marginal portion or an edge flange of an object to which the core is to be attached in use thereof. However, the core projections may be of other types or forms, such as in the core illustrated in FIGS. 19, 20 and 21-views which generally correspond to FIGS. l, 2 and 3 and to FIGS. 1l, 12 and 13.

In the embodiment of the invention illustrated in FIGS. 19, 20 and 21, the projections 60 pressed'or punched from the core-forming velements 61, 62 are of hollow, generally frusto-conical form, with the projections extending inwardly into the channel of the core when the core is in its inal channel shape, as in FIG. 21. As shown in FIGS. 20 and 2l, the overlapping end portions of the core-forming elements 61, 62 are interloeked by the core projections, Iand although said projections are not of pointed form, their gripping engagement with a marginal portion or an edge ange of the object to which the core is to be attached is generally sutiiciently to maintain the attachment.

In the embodiment of the invention illustrated in FIGS. 22, 23 and 24-views generally corresponding to FIGS. l, 2 and 3, to FIGS. 1l, 12 and 13 and to FIGS. 19, 20 and 21, the core projections 64 are not formed by pressing or punching them from the metal of the zig-zag disposed core-forming elements 65, 66 but are formed by lateral bending of the outer edge parts of the overiapping end portions of said core-forming elements, the bending being of right-angular form in this embodiment of the invention. As here shown, the core projections extend inwardly into the channel of `the core when the core is in its nal channel form, as in FIF. 24, but if desired, of course, the core projections may extend outwardly, or some may extend inwardly and others outwardly. As will be noted from FIG. 22, the core-forming elements are inclined with respect to the longitudinal axis of the core, so that the core projections are of generally triangular form, with pointed ends 6'7. Thus, the core projections of this embodiment of the invention, like the core projections of other embodiments, are capable of digging or biting into the objects to which the cores are to 'se attached in use thereof.

In the embodiment of the invention illustrated in FIGS. 25 and 26, the core formed by the zig-Zag disposed elements 69, 70 is of increased width so that it has not only a channel-shaped portion 7l for core attachment, as in the prior embodiments of the invention, but also, a side extension 72 for the reception of a sealing or bumper member 73, of rubber or other suitable yieldable or resilient material.

For core-attaching purposes and also to interlock the overlapping parts of the core-forming elements 69, 70 which are disposed at the upper edges of the side walls of the channel-shaped portion 71 of the core, prong or barb-like projections 74 are pressed or punched from the core-forming elements, as in the embodiments of the invention illustrated in FIGS. l to 18. Also, if desired and as here shown, prong or barb-like projections 75 are pressed or punched from those overlapping end portions 76 of the core-forming elements which constitute part of the side extension 72, and such projections 75 function, as shown in FIG. 26, to not only interlock the overlapping end portions 76 but also, to retain on the side eX- tension the sealing or bumper member 7 3.

In the embodiment of the invention illustrated in FIGS. 27 and 28, the overlapping end portions 78 of the coreforming elements 79, Sti are interlocked by prong or barblike core-attaching projections 81, as in a number of previously described embodiments of the invention. However, in this embodiment of the invention, the other portions of the core-forming elements 79, S9 are in spaced relation, rather than in abutting relation.

In the last of the embodiments of the invention here illustrated, namely, in the embodiment of FIGS. 29 and 30, the core-forming elements 82, 83 are separate pieces of metal, rather than integral parts of a long metal band, as in the previously described embodiments of the invention.

Although the core-forming elements 82, 83 of the ernbodiment of FIGS. 29 and 30 may be maintained in coreforming relationship by additional means, if desired, said elements are here maintained in such core-forming relationship solely by the core-attaching projections 84 which securely interlock the overlapping end portions of said elements, as in previously described embodiments of the invention.

From the foregoing description of a number of embodiments of the present invention, it will be quite evident that cores formed by zig-zag disposed elements having their ot/erlappin(7 end portions interlocked by core-attaching projections possess many important advantages, only some of which have been herein referred to.

What is claimed is:

l. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet metal arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, and a projection carried by each of the portions of each pair of overlapping end portions for gripping engagement with the structure to which the core is attached in use thereof, the projections of the core being of increased hardness to improve their attaching efectiveness.

2. A generally channel-shaped strip structure core, compr. g a pluraiity of core-forming elements of sheet metai arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, and a projection carried by each of the end portions of each pair of overlapping end portions for ripping engagement with the structure to which the core is attached in use thereof, the projections of the core being piated with a hard material to improve their attaching effectiveness.

3. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet metal arranged in generally zig-zag order with the end portions of adjacent elements' being in overlapping relation and constituting at least parts of the side walls of the core channel, and a projection carried by each of the end portions of each pair of overlapping end portions for gripping engagement with the structure to which the core is attached in use thereof, some of the core projections extending into the core channel and other of the core projections extending outwardly from said channel.

4. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet material arranged in generally zig-Zag order With the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side walls of the core channel, and a core-attaching projection carried by one of the end portions of each pair of overlapping end portions and extending through a passageway in the other end portion thereof to interlock the end portions of said pair of overlapping end portions.

5. A generaliy channel-shaped strip Structure core, comprising a plurality of core-forming elements of sheet materiai arranged in generally Zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, and a core-attaching projection carried by one of the end portions of each pair of overlapping end portions and extending through an aperture in the other end portion the cof to interlock the end portions of said pair of overlapping end portions.

6. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet material arranged in generaliy zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side walls of the core channel, and a projection carried by each of the end portions of each pair of overlapping end portions for gripping engagement with the part to which the core is secured in use thereof.

7. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet material arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, and a projection carried by each of the end portions of each pair of overlapping end portions for gripping engagement with the part to which the core is secured in use thereof, the two projections of each pair of overlapping end portions extending alongside one another and constituting, in effect, a single projection of two-part form.

8. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of resilient sheet metal arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, and a projection pressed out of each of the end portions of each pair of overlapping end portions for core-attaching purposes, one of the projections of each pair of overlapping end portions extending through the aperture formed by the pressing out of the other projection or said pair of overlapping end portions, with the consequent interlocking of said pair of overlapping end portions.

9. A generally channel-shaped strip structure core, cornprising a plurality of core-forming elements of sheet metal arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, the free edge part of each of the end portions of each pair of overlapping end portions being disposed substantially normal to the other parts of said end portions to thereby provide an edge projection for gripping engagement with the structure to which the core is attached in use thereof.

10. A generally channel-shaped strip structure core, comprising a plurality of core-forming elements of sheet metal arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, the free edge part of each of the end portions of each pair of overlapping end portions extending into the core channel at a substantially normal angle to n the other parts of said end portions to thereby provide an edge projection Within the core channel for gripping engagement with the structure to which the core is attached in use thereof.

11. A generally channel-shaped strip structure core, comprising `a plurality of core-forming elements of sheet metal arranged in generally zig-zag order with the end portions of adjacent elements being in overlapping relationship and constituting at least parts of the side Walls of the core channel, the free edge part of each of the end portions of each pair of overlapping end portions being disposed at a substantially normal angle to the other parts of said end portions to thereby provide an edge projection within the core channel for gripping engagement with the structure to which the core is attached in use thereof, the core-forming elements being inclined to the longitudinal axis of the core so that the edge projections are of triangular form and thereby pointed for improved gripping engagement.

12. A strip structure core, comprising a plurality of core-forming elements of sheet metal arranged in generally zig-Zag order With the end portions of adjacent elements being in overlapping relationship, one side section of said core being of channel form for straddling relationship with at least a part of the object to which the core is to be attached in use thereof, the outer edge portion of each side of said channel-shaped section comprising a pair of overlapping portions and each such portion being provided with a projection for gripping engagement with the part to Which the core is attached in use thereof, the other side sections of said core having yieldable material mounted thereon for sealing purposes or the like.

13. A strip structure core, comprising a plurality of core-forming elements of sheet metal arranged in generally Zig-zag order With the end portions of adjacent elements being in overlapping relationship, one side section of said core being of channel form for straddling relationship with at least a part of the object to which the core is to be attached in use thereof, the outer edge portion of each side of said channel-shaped section comprising a pair of overlapping portions and each such portion being provided With a projection for gripping engagement with the part to which the core is attached in use thereof, the other side section of said core extending outwardly of said channel-shaped section and being provided with projections for the attachment thereto of sealing material or the like.

References Cited in the le of this patent UNTED STATES PATENTS 2,026,972 Greene Jan. 7, 1936 2,336,835 Balfe Dec. 14, 1943 2,635,915 McKinney Apr. 21, 1953 FOREIGN PATENTS 801,271 Great Britain Sept. l0, 1958 

6. A GENERALLY CHANNEL-SHAPED STRIP STRUCTURE CORE, COMPRISING A PLURALITY OF CORE-FORMING ELEMENTS OF SHEET MATERIAL ARRANGED IN GENERALLY ZIG-ZAG ORDER WITH THE END PORTIONS OF ADJACENT ELEMENTS BEING IN OVERLAPPING RELATIONSHIP AND CONSTITUTING AT LEAST PARTS OF THE SIDE WALLS OF THE CORE CHANNEL, AND A PROJECTION CARRIED BY EACH OF THE END PORTIONS OF EACH PAIR OF OVERLAPPING END PORTIONS FOR GRIPPING ENGAGEMENT WITH THE PART TO WHICH THE CORE IS SECURED IN USE THEREOF. 